I made something similar to that last year. But rather than mounting a seaperate rod in the stabilizer hole mine simply clamped to the end of the cable guard rod and was centered on my string about 1.5 inches above the nock of the arrow. I made it using a Sims limb saver just like the STS. It turned a very quiet bow making only a low thudd sound to a much louder thwack sound. It was noticibly louder with that thing installed so I immediately took it off.

Maybe mine being much closer to the center of the bow made a difference in the noise level mine made but it only made my bow louder.

Besides, there have been similar products on the market that do the same thing the STS does for a long time now so what is so special about this one?